Manhole construction



Dec. 6, 1927. 1,652,043

o. 'r. NELSON MANHOLE CONSTRUCTION Filed Feb. 28,1924

Elma 14301 Odie ZNe/son,

Patented Dec. 6, 1927.

OLLIE '1. NELSON, OF W AU KEGAN ILLINOIS. I V

MANHOLE coNsTRUo'rIon.

Application filed February '28, 1921. ,si-ia No. 695,799.

, v This invention relates to an improvement manhole constructions, and is particularlydesigned for use with boiler shells and the shells or headsof tanks where the boilers orjtanks are electrically welded. T .Theobject of the invention is to provide a. manhole construction of this character which is adaptable for settinguinto or for organization with flat, cylindrical, spherical, curved, or. irregular surfaces without any changes'in the-essential features ofthe manhole construction and wherein the parts of the manhole construction which are'required-to be secured together of the boiler or tank are united by electric welds.

Other objects'and advantages of the in-.

vention reside in certain novel features of the construction, combination and arrange,- I

ment' of parts which will be hereinafter more fully described and particularly point-.

p ed out in the appended claims, reference bement of the invention, the numeral desig-' ing had to the accompanying drawings forming part of this specification, and in which: V

Figure 1 is a plan view, showing the preferred embodiment of the invention;

Figure 2 is a view in vertical section, on line 22 of Figure 1; and

Figure 3 is a view in end elevation. Referring to; the drawings wherein for the sake of illustration is shown oneembodinates the shell of a boiler, tank or the like.

A hole or opening 11 of proper size and shape is cut in the shell 10 and in this embodiment of the invention is shown-as being of elliptical form.

An internal manhole band, designated generally at 12, is provided. This manhole ring 12 is constructed of a single piece of metal, such as steel, which is formed tothe correct shape and which has its ends welded together, this embodiment of theinvention, the band 12is of elliptical form but it is to be understood that this band like the opening 11 may be made of any suitable form and size. The band 12 is snugly fitted in the openin 11 and the outer periphery of the band is welded, as at 14, to that portion of the shell 10 which defines the opening 11. With' this arrangement one end of the band 12 is disposed within the shell 10 and the other or to the shell as indicated at 13, in Figure 1. In-

e'ndof the band is disposed without the shell. The end of the band 12 disposed within the shelliisdesignated at 15 and is machined for coaction with a gasket 16 to provide a packed joint as will presently appear.

manhole cover 17 is applied to the inner end ofthe band 12 and the 'inarginal portion of thecover 17 engages the gasket 16 toprovide the 101111? hereinabovereferred to. A

guidefiange 18 of angular form in cross section is welded to the cover 17 and coacts I with theband '12.

Releasablemeans is provided for'holding the cover 17 III position-and this means preferably coacts with the cover 17 and with the outer end ofth-e band 12for this pur pose. This releasable means includes a socket 2O welded to'the cover 17 and having a slot designated generally at 21 in the top thereof, theslot 21-having an enlarged central portion 22 and narrow branches 23.. A manhole crab 24 spans the outer end ofthe band 12; A bolt 25 is provided and has a -head26 which may be inserted through the large central portion 22 of the slot-21 and then slid into position below the portions of vthe top of the socket 20 which define the narrow branches 23 of the slots 21, the head 26 engaging such portions of the topcof the socket 'as shown in Figure 2. The shank 27 of the bolt 25' extends through an opening provided therefore in the crab 2 1 and projects beyond the upper end of the crab. A nut 28, is threaded on the upper end of the shank 27 of the bolt 25 and coacts withzthe crab 24Lto draw the bolt 25 upwardly and consequently to urge the cover 17 tightly.

against the gasket 15 which is fitted between the cover and the inner end of the hand 12.

Preferably agwasher 29 is interposed between the nut 28 and the crab24t. With this arrangement when the nut 28 is loosened the bolt 26 may be disengaged from the socket 20 and the cover17 removed from the manhole. The socket 20 aflfords a means for manipulating the cover when 7 removing and placing the same in position.

It will now be understoodthat the parts of the manhole construction which are to be secured to each other or which are to be secured to the shell of the boiler or tank are united by electricwelds in a novel and effective manner.. Moreover the manhole construction is adaptable for organization with flat, cylindrical, spherical, curved, or irregular surfaces without any changes in the essential features of its construction.

I claim 1. In a device of the clmracter described, a shell having an opening longer than it is wide, an internal manhole hand constituted of a single piece oi nietal bent to lit in said opening, said hand being shaped to completely lill said opening at its periphery, the ends of the shaped band being then Welded together, a Weld between the outer periphery of the hand and the "all of the opening or shell said hand and peripheral Weld being of snrhstrength and size as to rcin'l orce the shell to the extent necessary to eoinpenstae for the inetal cut-away from the shell to form the opening therein, a manholeeover applied to the inne edge of the hand, and means cooperable with the cover and spanning and engaging the outer end of the band for holding the cover in position.

2. In a device of the character described, a shell having an opening longer than it is wide, an internal manhole band constituted of a single piece of metal bent to fit the opening and shaped therein, a Weld between the ends of the shaped piece of metal, and a weld between the outer periphery of the hand and the wall of the opening of the shell.

S. A method of making manholes consisting in providing an opening in a sheet of nietal tali'ing asingle piece of metal to form a hand, bending said piece and fitting itvithin said opening to form a split band, welding the ends together, and welding the periphery of said hand to the periphery of said opening".

.OLLIE T. NELSON. 

